Date: Tue, 01 Jul 2014 13:33:35 +0200 From: "Ronald Klop" <ronald-lists@klop.ws> To: mexas@bris.ac.uk, rene@freebsd.org Cc: freebsd-arm@freebsd.org Subject: Re: /tmp, /var/log, /var/tmp as /dev/md - why? Message-ID: <op.xibg19edkndu52@ronaldradial.radialsg.local> In-Reply-To: <201407011046.s61AkJpj006890@mech-cluster241.men.bris.ac.uk>
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On Tue, 01 Jul 2014 12:46:19 +0200, Anton Shterenlikht <mexas@bris.ac.uk> wrote: >> From r.c.ladan@gmail.com Tue Jul 1 11:37:35 2014 >> >> 2014-07-01 11:25 GMT+02:00 Anton Shterenlikht <mexas@bris.ac.uk>: >> >>> Why is it a good idea to mount /tmp and some var dirs on memory disks: >>> >>> root@raspberry-pi:/usr/ports # df -m >>> Filesystem 1M-blocks Used Avail Capacity Mounted on >>> /dev/mmcsd0s2a 14694 777 12742 6% / >>> devfs 0 0 0 100% /dev >>> /dev/mmcsd0s1 16 3 13 20% /boot/msdos >>> /dev/md0 28 4 22 16% /tmp >>> /dev/md1 14 0 12 0% /var/log >>> /dev/md2 4 0 4 0% /var/tmp >>> root@raspberry-pi:/usr/ports # >>> >>> Is this about speed or power, or maybe space? >>> >>> Mostly write tear because you're using an SD card, and it improves >>> speed >> too. > > "write tear"? > Is this a joke, or some technical term? > I cannot find what it means. If you search for "write tear ssd" you get a lot of hits. It means that a lot of people like to reduce the number of writes to flash disks. > I get these messages on the console (well, on hdmi port...): > > pid ... (svnlite), uid 0 inumber 13 on /tmp: filesystem full > > If I unmount /tmp from md and leave it on sd card, > then I don't see these anymore. What does this mean? That the default setup is not suitable for your use case, because you write more to /tmp than the person who made the installation. And that you can change the /tmp mount as you like. Regards, Ronald.help
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